This is a clay tablet that will be part of a Halloween party game. It was sculpted from homemade paper clay, my new favorite material. For something like this it's absolutely ideal. Cheap, easy to work, and tough enough to withstand handling by a horde of kids.
I added some pigment powder to give the plain white clay a light brown base color. The lettering was scribed with a stylus and then the whole piece was impressed with a stone from the driveway to give it some texture. I followed that up with a heat gun to force some surface cracking and then let the piece dry. The final finish treatment was a rubdown with wax-based schmutz to dirty it up.
The one thing about the final prop that surprised me was it's heft. I thought it might come out feeling far too light to pass as mineral clay, but if anything it's heavier than the real stuff.